Hydraulic transmission gear



` Aug. 30, 1938. n G. KLEPPER HYDRAULIC l TRANSMISSION GEAR- Filed April7, 1937 Irverwcor 'Gust/ay Kleppen v by 7?/ l Fig. 2, of a hydraulicgear il against similar Patented Aug. 30, 1938 UNITED .STATES I azaszsHYDRAULIC 'raANsMrssroN Gaim Gustav Kliepner,

'- many, assgnor to Berlin-Charlottenburg, Ger- General ElectricCompany,

a4 corporation o! New York Application In ZCIaims.

My invention relates to hydraulic transmission gears, and moreparticularly to the Fttinger type of hydraulic transmission gear.

One object of my invention is to provide im- 5 proved means forcirculating the uid of the transmission through a cooling circuit.

For a better understanding of my invention.'

together with other and further objects thereof, reference is had to thefollowing description taken l0 in connection with the accompanyingdrawing, and its scope will be pointed out in the appended claims.

In the accompanying drawing, Fig. 1 is a side view, partly in crosssection along line I--I of embodying my invention, and Fig. 2 is asectional view of the fluid directing elements mounted on the hub of thehydraulic vgear illustrated in Fig. 1; the section illustrated in thisfigure the sectional view of the same elements illustrated in Fig. 1.

Referring to the drawing in detail, Fig. 1 is a vertical cross sectionalview, through the center, of the gear assembly, and discloses a hollowdrive shaft I mounted in a bearing 2 and provided with a flywheelcomprising a plate 3, and a ring 4, the 4inner surface of which is ofthe inner surface of a housing for the transmission gear. Acomplementary annular member 5, the cross section of which parallel toits axis of rotation is substantially semicircular, is bolted to the rimof the ring 4 by bolts 6. These two members 4 and 5 thereby form anannular casing which rotates with the shaft I. One side of this casingis closed by the plate 3 and through the other side several elements,hereafter described, project into the casing. Attached to the innersurface of the annular member 5 are -pump varies 1 and B having acombined area of approximately one-quarter of the cross sectional areaof the casing. The vanes 1 and 8 are separated into two parallel groupsof vanes by an annular fin 9, the .vanes B being attached to the fin 8and member 5 respectively, and the vanes 1 are held in spaced relationto each other by being attached to the opposite side of the iin 9 and attheir other ends to a ring member I0. vThe vanes 1 circulate a fluidwithin the casing when the shaft I is driven, and direct this uid vanesII mounted on a turbine wheel I2, which is attached to a driven shaft I3by means of a hub member I4 and a key I5. The driven shaft I3 isaxiallyalined with the driving shaft and projects into the casingthrough its 55 open end. The venes II are directly attached to being atright angles to f dished and forms a part April 7, 1937, Serial No.135,561 Germany April 23, 1936 (c1. esc-54) v an annular member I6 whichis bolted to the turbine wheel I2, and the vanes are separated at theirrespective other edges by an annular member I1.

A thirdelement of the gear comprises a wheel 5 I8, provided with vanesI9 which are held in position at their other ends by a ring 2li whichtogether with the rings I0 and I1 forms a circular core within thecasing and thereby forms an annular path in which a suitable fluid isset into motion by pump vanes l against the turbine vanes Il,.therebysetting this wheel into motion and then, after giving oil part of itsenergy, striking the varies I9 Which'redirect the fluid to the pump`varies 1. The wheel I8 is further provided with a hub 2| which ismounted in a roller type of overrunning clutch 22 which allows thiswheel to rotate only in the forward direction, that is in the directionof the pump and turbine wheels. The hydraulic gear so far described isdisclosed more fully in Patents 1,199,359, and 1,199,360. Fttinger, andit is believed unnecessary to set forth in greater detail the operationof this mechanism in the present application. 1

In accordance with my present invention, `I provide an improved meansfor circulating the fluid in the hydraulic gear casing through a coolingcircuit. My improved means includes a pump incorporated within thehydraulic gear; the pump being an integral part of the gear, therebyeiect- 30 ing a minimum of increase in the bulk of the gear. Thecirculating pump comprises, in part, the pump vanes 8 mounted on thepump or driving element of the hydraulic gear, and separated from themain pump or driving vanes by the fln 9. The circulating pump vanes 8are of a slightly larger diameter than the main pump vanes because ofthe resistance encountered in the cooling circuit. The pump vanes 8discharge the cooled fluid into the space between the casing member 5and the turbine wheel I6, from which space it enters the operatingcircuit in the gear through the clearancev space between the iin 9 andthe turbine wheel I6. The iluidv is directed to the varies throughchannels placed in a pair of telescoped sleeves 23 and 24 which areplaced between the hub 2l and the flange 25 on the casing member 5.

The circulating channels for cooling the uid of the hydraulic gear maybe readily understood by reference to both figures of the drawing. Fig.1 is a cross sectional View of the apparatus in a vertical plane throughthe axis of the apparatus and Fig. 2 is a cross sectional view of thesleeves 23 and 24, also taken through theaxis of thev apparatus, but ina plane which is at right angles M to the plane of the' sectionillustrated in Fig. 1. Fig. 2 shows sleeve 23 in cross section from e'ndto end and sleeve 24 in cross section for only one'- half of its length,the other half being a view of its outer surface. In the outer surfaceof the inner sleeve 24 are grooves 26 and 21 which run parallel to theaxis of the sleeve. They are alternately arranged and equally spaced'over this surface. The grooves 26 extend from a point within a shortdistance of the end of the sleeve 24 to a point within a short distanceof a flange 28 on the other end of this sleeve., .The grooves' 21 extendfrom the end of the sleeve- 24 up to the inner surface of the flange 23,The sleeve 23 ylits snugly over the surface of the sleeve 24,

thereby closing the grooves, and thereby form- 'ing ducts through whichthe gear fluid circulates. The sleeve 23 is provided with holes 29 whichregister with the ends of the grooves 26 and is further provided with aflange 30 which, together .with a ring 3|, provides an annular header 32holes 33. The header 32 opens into a hollow boss 34, illustrated in Fig.1, into which a pipe 35 is threaded leading to anyrsuitable liquidcooling .unit or system (not shown).

supported by a collar 36 attached to the stationary housing 31 of thistransmission. By reference to Fig. 1, it will now be understood thatfluid reaches the circulating pump vanes through the pipe 35, header 32,grooves 26, holes 29, and holes 38 in asleeve 39 mounted between theflange 25 on the casing member 5 and the sleeve 23.

'Ihe grooves 21 in the surface of the sleeve 24 extend from the end ofthe sleeve to the surface of its flange 28 at the other end. .The'openend -of thegrooves 21 open into the inside of the gear casing in a spacebetween the hub 2| and the sleeve 39, the sleeve 39 being, as abovestated, be- 4 tween the sleeves 23 and flange 25 on the member 5 andextending, axially from the inner, or base, end of the flange on hub 2|to the ange 30 on the sleeve 23. The fluid in the casing of the gear issucked into the grooves21 and is collected in a header 40 formed betweenthe flange l28 and the outer surface of the ring 3|, which also formsthe header 32. The header is provided with a hollow boss 4| from which apipe 42 carries the fluid to the cooling apparatus (not shown). Thecorn-y plete cooling circuit therefore begins-at the ends of the grooves21 in the casing of the hydraulic gear wherein the liquid is heated dueto the trans-O mission of power and is sucked through these grooves tothe header 40, from the header to the pipe 42, tothe cooler Y(notshown), from this cooler through pipe-35, header 32, grooves 23, pumpvanes 8, and back into the casing.

I .have therefore provided a simple means for The' pipe 35 is also 4arranged in said casing and attached to said wall, a turbine wheel insaid casing attached to said second shaft and provided with vanes, a uidin said casing circulating between said pump and turbine vanes duringrotation of the said casing, and means for cooling said uid including adividingfln on said pump vanes, said fin forming with said turbine wheela working circuit for said l'pump and turbine vanes and simultaneouslydi- .;viding the surface of said pump vanes to form a second group of`pump vanes between itself and the wall of said casing, said second groupof `pump vanes being separated from said ilrst set of pumping vanes butrotating in unison therewith, a sleeve surrounding said driven shaft andlprovided with ducts opening respectively into said casing and to theintake end of said second pumping means, separate headers on sai`dsleeve, and connections thereon adapted for connection to the terminalsof a cooling system whereby fluid from said casing is circulated throughsaid ducts and said cooling system by the said second pumping means. i

2. In a hydraulic power transmitting gear, a

pair of shafts, an annular casing attached to one of said shafts andprovided with pumping means comprising two sets of pumping vanesattached to the wall of said casing, a dividingfin dividing said pumpmeans into two parallel channels, a

turbine wheel attached to said second shaft, a

fluid in said casing circulated by a portion of said pump means totransmit power between said shafts, a sleevek surrounding vsaid drivenshaft provided with a series of parallel grooves on its surface and witha flange, a second sleeve surrounding said outer surface thereby closingsaid grooves and provided`with holes connecting alternate ones of saidgrooves to the intake side of the second portion of said pumping means,and provided with a flange which with the flange on said first sleeveforms two separate headers to which said alternate grooves arerespectively connected and connections to said headers adapted forconnection to a cooling system.

GUSTAV

